filterx: `set_fields()` #1215

Job	Run time
create-source-tarball	1m 57s
create-packages / almalinux-8	3m 57s
create-packages / almalinux-9	7m 27s
create-packages / debian-bookworm	6m 44s
create-packages / debian-testing	6m 25s
create-packages / fedora-41	8m 16s
create-packages / ubuntu-noble	9m 10s
	43m 56s

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